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Autres articles (28)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

  • De l’upload à la vidéo finale [version standalone]

    31 janvier 2010, par

    Le chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
    Upload et récupération d’informations de la vidéo source
    Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
    Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)

Sur d’autres sites (2745)

  • How do I add a delay between a camera and a livestream using ffmpeg, since -vf tpad=start_duration does not really delay the network stream output ?

    21 juin 2022, par Ken Ocheltree

    In trying to add a 10 second delay between a number of cameras and livestreams being fed into OBS, I wanted to be able to switch the stream before certain events occurred and the 10 second delay would allow that.

    


    I found that using a command of the form :

    


    ffmpeg -i input -vf tpad=start_duration=10 -af adelay=10000|10000 stream-out


    


    would insert 10 seconds of blank content at the beginning of the video stream, but that it would stream out all of the blank content in the first several seconds so that the outgoing livestream was effectively caught up with the incoming camera stream.

    


    Looking at the outgoing network traffic, I would see a burst of high network traffic when the stream starts sending the first 10 seconds of data and then the network traffic settles to the usual constant traffic level for the video stream.

    


    If I start watching the outgoing stream at the beginning, there is a 10 second delay in the livestream that stays as I watch. If I ever lose the stream and reconnect or start watching the stream after it was already running, the 10 second delay is no longer there.

    


    I am really trying to cause ffmpeg to delay the sending of the output stream in time, so that it is always buffering 10 seconds of data, and the -vf tpad=start_duration=10 -af adelay=10000|10000 commands do not do that.

    


    Is there another ffmpeg command that will force the actual output traffic of ffmpeg to stay delayed ?

    


  • How do I add a delay between a camera and a livestream using ffmpeg, since the -vf tpad=start_duration does actually delay the stream coming out ?

    12 août 2020, par Kenneth Ocheltree

    In trying to add a 10 second delay between a number of cameras and livestreams being fed into OBS, I wanted to be able to switch the stream before certain events occurred and the 10 second delay would allow that.

    


    I found that using a command of the form :

    


    ffmpeg -i input -vf tpad=start_duration=10 -af adelay=10000|10000 stream-out


    


    would insert 10 seconds of blank content at the beginning of the video stream, but that it would stream out all of the blank content in the first several seconds so that the outgoing livestream was effectively caught up with the incoming camera stream.

    


    Looking at the outgoing network traffic, I would see a burst of high network traffic when the stream starts sending the first 10 seconds of data and then the network traffic settles to the usual constant traffic level for the video stream.

    


    If I start watching the outgoing stream at the beginning, there is a 10 second delay in the stream. If I ever lose the stream and reconnect or start watching the stream after it was already running, the 10 second delay is no longer there.

    


    I am really trying to cause ffmpeg to delay the sending of the output stream in time, so that it is always buffering 10 seconds of data, and the -vf tpad=start_duration=10 -af adelay=10000|10000 commands do not do that.

    


    Is there another ffmpeg command that will force the actual output traffic of ffmpeg to stay delayed ?

    


  • Preparing audio file to be used in EME

    6 août 2020, par Rikard

    I want to process wav files so I can use them in the browser with MSE and EME.

    


    I am able to convert to .mp4 and play with MSE, but when I encrypt the file the player doesn't work. No error is triggered, the encrypted event in EME never fires. So keys are never asked to be confirmed.

    


    What can I me doing wrong ? How should I convert/encrypt the file ?

    


    My pipeline of command right now :

    


    ffmpeg -i long_input_44100.wav -ar 48000 -ac 2 output/long_input_44100_000.wav 
ffmpeg -i output/long_input_44100_000.wav -strict experimental output/long_input_44100_000.mp4 
MP4Box -dash 10000 -frag 10000 -rap output/long_input_44100_000.mp4 
ffmpeg -y 
    -i output/long_input_44100_000.mp4 
    -encryption_scheme cenc-aes-ctr 
    -encryption_key 76a6c65c5ea762046bd749a2e632ccbb 
    -encryption_kid a7e61c373e219033c21091fa607bf3b8 
    -frag_duration 10000 
    output/long_input_44100_000_encrypted.mp4


    


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